William p



WA P... HAMMOND. PRESSURE GAGEAND PUMP CONNECTION.

APPLICATION FILED 0m19.191s. IIEIIEwED IuIY 2.1m.

1 ,330,759. Patented Feb. 10, 1920.

LII'QIIIIIIIII@ V "4I J am A TTUHNE V8 UNITED srarns EN lFlCE.

WILLIAM P. HAMMOND, 0F PASSAC, NEW JERSEY, ASSIGNR TO A. SCHRADERS SON, INCORPORATED, OF'BROOKLYN, NEW YORK, A CQRPORATGN 0F NEl/V YORK.

PRESSURE-GAGE AND PUMP CONNECTN.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed December 19, 1913, Serial No. 807,689. Renewed July 2, 1919. Serial No. 308,293.

To all u1/wm t may concern:

Be it known that I, WILLIAM l). HAMMOND, citizen of the United States, residing at Passaic, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Pressure-Gages and Pump Connections, of which the following is a specification.

The present invention relates to a combination pressure gage and pump connection for duid pressure containers such as pneumatic tires, and alsoto novel means for quickly and detachably connecting a pressure gage, dustcap, or like member to the valve casing of a pneumatic tire.

One of the objects of the invention is to provide a combination pressure .gage and pump connection for pneumatic tires which can be quickly placed in position or removed therefrom, and whichy embodies novel features of construction whereby an outlet or blow-off valve isautomatically opened when the pressure within the tire has been built up to the predetermined point, thereby preventing overintlation of the tire. Further features of the invention reside in the provision of means for adjusting the pressure at which the blow-oil valve will be opened, and also for preventing the blow-off valve from being prematurely actuated by fluctuationsin pressure from the strokes of the pump.

A further object of the invention is to provide a novel means for quickly and detachably connecting a pressure gage, dust cap or the like to the valve casing of a tire whereby the member is held securely in position although it can be quickly removed without the loss of time which is always incident to such an operation where a threaded connection .is employed.

With these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being Ypointed out in the appended claims.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a longitudinal sectional view through a combination pressure gage and pump connection constructed in accordance with the invention.

Fig. 2 is a side elevation of the same.

Fig. 3 is aside ele'ation of a slightly modified construction of the pressure gage and pump connection, showing also the upper end of the valve casing.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawing by the same reference characters.

Referring to Fig. 1 which illustrates a combined pressure gage and pump connection constructed in accordance with the invention, the numeral l designates the main casing which is shown as open at both ends and provided with an intermediate transverse partition 2 subdividing the casing into an upper chamber A and a lower chamber B. A cap 3 is litted over the lower end of the casing l, said cap having an opening l therein adapted to loosely receive the valve casing of a tire valve. A rubber washer member 5 fits against the upper surface of the cap 3 and is clamped between the said cap andthe lower end of the casing l, the central portion of the washer member being formed with an upwardly proj eeting nipple member 6 adapted to lit closely around the tire valve casing so as to produce a tight joint therewith. A tubular pump connection 7 projects laterally from one side of the casing l and communicates with the lower chamber B, and a valve opening pin 8 projects downwardly from the partition 2 so as to engage the val-ve stem of the tire valve and open the tire valve when the device is applied thereto. This valve opening pin 8 is formed with a constricted duct 9 leading from the chamber A to the chamber B whereby the said :chamber A has the same internal pressure as the pneumatic tire, although it is shielded against sudden fluctuations of pressure from the pump.

A diaphragm 10 is fitted over the upper end of the casing l and carries an upwardly projecting` valve tube ll which is slidably mounted within the outer tubular casing 12. it. central opening 13 in the diaphragm l0 communicates with the interior of the valve tube ll while the outer end of the valve tube is closed by an inwardly opening valve 14, said valve being held yielda'bly upon'its seat in the usual manner and being provided with a valve stem l5 projecting beyond the end of the valve tube. A fixed abutment such as a transverse pin 16 is arranged within the outer end of the tubular casing 12 for engagement with the valve stem 15 to open the valve 14 and thereby release the pressure within the fluid pressure container or pneumatic tire when the pressure acts upon the diaphragm 10 with suiiicient i'orce to move the same outwardly andv bring the valve stem 15 against the abutment 16.

The outer end oi' the valve tube 11 may be surrounded by a guide sleeve 17 which slides freely within a guide sleeve 18 fitted within the interior of the tubular casing 12. Interposed between the shoulder at the lower end of the guide sleeve 18 and the diaphragm 10 is a coil spring 19 which normally tends to move the diaphragm inwardly and resist the action of the pressure within the chamber A upon the diaphragm. The tubular casing` 12 is carried by a cap 20 threaded upon the upper end of the casing 1, and it will be obvious that by screwing this cap either one way or the other the tension in the spring 19 may be increased or decreased as fou-nd desirable. As indicated by Fig. 2, the exterior of the cap 2O is provided with a knurled portion 21 adapted to be readily engaged by the fingers, and also with graduations 22 adapted to coperate with a pointer 23 on the pump connection 7 to engage the interior pressure within the tire which must be reached before the blowoff valve 14 will be opened. With this construction it will be obvious that the operator adjusts the regulator cap 20 upon the casing 1 until the pointer 23 is opposite that indication 22 ot the scale corresponding to the maximum pressure which itis desired to build up within the tire. The spring 19 will then cause the diaphragm 10 to resist the internal pressure within the chamber A until the predetermined maximum pressure is reached, at which time the outward movement of the diaphragm and valve tube 11 will be sutlicient to bring the valve stem 15 into engagement with the abutment 16 and unseat the valve 14. The pressure within the tire will thus be relieved, although the valve 14 will again close as soon as the pressure falls below the predeteri'nined pressure.

One manner of securing a quick detachable connection between the pressure gage and pump connection and tire valve casing 1s shown by Figs. 1 and 2. This form of fastening includes a pair of opposed spring arms 25 projecting downwardly from the stock or body portion of the pressure gage and adapted to be disposed on opposite sides of the tire valve casing. In the present instance these spring arms 25 form the end portions of a spring strip of metal, the middle portion of the metal strip being riveted or otherwise permanently connected to the cap 3. The lower or free ends of the spring arms 25 carry the inwardly projecting and overlapping plates 26 which have openings 2T therein oi' a sullicient size to loosely receive the tire valve casing. The resiliency or spring` action ot the arms 25 normally holds the openings 2'? out of alinement with each other or in an oil'iset relation, although when the spring arms are forced inwardly by graspingthem between the iingers and applying pressure thereto in any other suitable manner the openings 27 may be brought accurately into registry so as to admit of the device being slipped over the tire valve casing. As soon as the pressure' gage has been properly seated upon the end of the tire valve casing, the spring arms 25 are released and the edges ot the openings 2T in the overlappingplates 2G thereby caused to grip opposite sides ot the tire valve casing so as to produce an interlocking` connection therewith and securely retain the device in position.

Having thus described the invention, what claim as new and desire to secure by Letters Patent, is

1. A device of the character described including a casing having a pump connection and provided with means tor attachment to a tire valve casing, a diaphragm upon the casing, a blow-oit valve carried by the diaphragm, a cap adjustably mounted upon the casing and carrying a shoulder, a spring interposed between the shoulder and the diaphragm, the tension of the spring being regulated by adjusting the cap on the casing, and an abutment in the path of the blow-ofil valve for engaging and opening the same when a predetermined pressure is reached.

2. A device of the character described, including a casing subdivided by a transverse partition into a valve chamber and an open ended diaphragm chamber, a constricted duct being provided between the two chambers, a diaphragm stretched across the Open end of the diaphragm chamber and closing the said chamber, a blow-oil3 valve carried 110 by the diaphragm and movable therewith, an abutment arranged in the path of the blow-oft valve for opening the same when a predetermined pressure is reached, an adjustable mounting for the abutment, a pump connection leading to the valve chamber, and means for connecting the valve chamber to a tire valve casing.

3. A device of the character described including a casing having open ends and provided with an intermediate, transverse partition subdividing the same into a diaphragm chamber and a valve chamber, a diaphragm closing the diaphragm chamber,

a blow-ott valve carried by thediaphragm, an abutment arranged in the path ot the blow-ofi? valve for automatically opening the same when a predetermined pressure is reached, a cap closing the valve chamber and provided with an opening to receive the tire valve casing, a valve opening pin projecting from the partition and arranged opposite the opening' of the. cap to unseat the tire valve when the device is applied thereto, a constricted duct being provided between the diaphragm chamber and the valve chamber, and a pump connection leading to the valve chamber.

4. A device of the Character described including a casing subdivided by a transverse partition into a diaphragm chamber and a valve chamber, a constricted duct being provided between the two chambers, a diaphragm extending across the diaphragm chamber, a valve tube carried by the diaphragm and in communication with the diaphragm chamber, a blow-oil valve within the valve tube, a tubular guide Within which the valve tube slides, an abutment within the tubular guide for engaging the blow-ofi1 valve and opening the same when a predetermined pressure is reached, a cap adjustably mounted upon the main casing and carrying the tubular guide, and a spring engaging the diaphragm and arranged to have the tension thereof regulated by adjusting the cap upon the main casing.

5. An air valve comprising a casing, a diaphragm therein adapted to be acted on by air pressure, a sleeve carried by said diaphragm, adjustable means for guiding the movement of the sleeve, a compression spring acting between said guiding means and diaphragm for resisting the action of the diaphragm, a valve mechanism within said sleeve, and means carried by said guiding means for engaging said valve mecha nism after a predetermined displacement of said sleeve whereby the air which acts on the diaphragm is permitted to escape.

In testimony whereof I aix my signature in presence of two witnesses.

WILLIAM P. HAMMOND.

Witnesses:

IRENE MULGAY, P. FRANK SONNEK. 

